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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '981658bc375a39580e91073163db9532db6eb51029ac7abedf6537e593176684' 
  AND token = 'yEkRrxe1FDRRs8XNpLA3W1YZSTgJUBym4sWS0sHHn8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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