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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48361e6a25eb28d4aafa22d966ce0512d4f55f1bf9a67b899f9df3ea181c3987' 
  AND token = 'ChhWlfs0v52RZCCuMQFLanoIzvSNWIk3hLFZaHScv8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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