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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df477b822abde7c0226505f3b182ef9e7950681959ed61db92c6edb937cd7219' 
  AND token = 'coiAol9nToKJviaI4d/PX6XqvMxojek9cdZQFSBNbAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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