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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e96ae0833e3e1a245d763effa895fab305510d2002bad25d1cbeb911b0c266' 
  AND token = 'IaIK8RWVVttiA7f48I0aKJZMLTfVN+oTOq7tipJqCnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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