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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb95a35572bd62be506920efd67b57c4aff61e06dcf0ede87e36bd72c5a7f76' 
  AND token = 'DFzbMr92o8KXh4iQYq/SnjlKesM11TpAv2I618YTh8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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