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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7335b1f566822987c26675b85d2bf01960ab0a1442360ccb803848ef85cecf97' 
  AND token = '2m/8L/FQw1lTl0cO+uBLjojOG1gMQTp6b5qe71nPLNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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