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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0692fc50efd2c48c6cc7b889042c20f1054f22a94fbe30d9c292db8e5b8901' 
  AND token = 'QGCLPZC3O0v/RQPb8krmzZHO126t9TbNJbcemcZvbAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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