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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe41d56875ded7ceb4d14b77f5d8522fd0481341824722f4beac60a26e7883c' 
  AND token = 'kxczKzQkmTaNOvVuA2LyE3jB6SCW4Nm55DwNF6WPXG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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