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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c61aef2cbd30a4b5291e38dac8a33a183fb3866055bddad2993b43a07dc9c6' 
  AND token = '2bx3kPvDzutbvmidoQqKfmCFyXFmp0Qxrv/kqq6bIxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}