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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d80cba9991d3a3f3daa0b26b6dc55f0c9890f91e56a07eda72f3ac83a5bd20b' 
  AND token = '24RtpTf6C/uw5mPDBAK1IUYq8kxrFIPo2xBGvfex5oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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