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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92846c3d55923d04dc9448551eb0e4561e56e342c2acf21349ef694a9d189b06' 
  AND token = 'pyQEmQvhkhnI0uWo1S4n562ijS0jo4dcSzk0NQdq7sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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