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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '254b4709a9344467a31dc4aac59845e3afa8244eec5d34fe114329a93744f3b6' 
  AND token = 'LnncqGxJD3yY7OE30QPWZgqq5YstTDiE7B+EK3tNVqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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