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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1bf6ced879fb2c4b8f0a45a71378c77c7d55328405fda13011b796627b14829' 
  AND token = '9um7c81pbXumk8yScdJu6hm68syxI87aRjt2kiEV1Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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