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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feca641579f01369287a24f53e3530a3134911596a6d1b2cc7a24f8a9d8e0790' 
  AND token = 'Hp8mBbKXR7G6nChUL/OoPBAyQwM2ecn9EwIgS9Q/BHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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