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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360c487dfa6d8ab571e6ae08a0d51cb363076477899ae7bd9f100f0a3723906d' 
  AND token = 'W9Q1PUOAMj4/FEx2iT5zecHsZfA8j9Dv364SEKAZv8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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