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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97fc60534ca26ed8053f062f493c8c27f2b5ddae756e83abf44cee280bd0d9ef' 
  AND token = 'B6TmSTazAmPXvlD7PFdokR8I6co24NFkdG5Cc/78FS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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