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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89dc636fd18b541069f1d03e6f466cf091e4d9903d685ea5780bb73c58e8ef78' 
  AND token = 'sR5sIMfzHceM7kIMyIuahWm07KXqRQ3dY/nrkSF7dls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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