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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54d028dc52e2180068b8f7dfe2ec451875de043e808c751c4c9004955dd232ae' 
  AND token = 'FTAq/YDOkvkUSquafFNX1TnzQrZocRTDK/Ag2Yze8ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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