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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a17f48b260ae3267b8a590d3fd2ba7a9bee2cc5d386ea84c9b8a5089d41411f' 
  AND token = 'sSchhiT4v86ktuDKSv9mDMqcQs67TpFJYBaA+3pV+2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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