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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b834ef44014be85d37671044f0b029c80eb817dedda4444b92f4887674896693' 
  AND token = 'j5XMAES1tfitDR4TzBwI7wUAoLt4FVWP7VYRTQ+GRFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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