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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee7311a97b31a636f828319e1902bff40c37e99536f48de740743f6d42fab2e1' 
  AND token = 'asws3LtcQYLFho2VrKPafgMpkTBjKXbOBjq1G4q3a3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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