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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7166e3479400a88ce8ff333139a4d0a8ef9f525e458ebd310b04e864c0c6812' 
  AND token = 'yGNdIN0WwTrxsHuachWS/eQE/ooplE4gJT5tP/S4ZIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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