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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe2ecf467b68a4f3d76e2c5ffc20ab7f1c73a9d1fa4cd7cfb32f7041b8632fd' 
  AND token = 'c62bp9yafMFbzN8YcgbuzBQfXjUvNp33OB2QK3nLdbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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