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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c036130c7aa34fbefc85fa7a83a3cff34e3e97421a18b68433c8ecb311e345c9' 
  AND token = 'pUZ/FLhEXpYu8b+RTR3VBva89NU5L/y5vO/TB+Haa84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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