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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd6253521b16953631291653d70debbea556bda108a6deb7739df506b20077b6' 
  AND token = 'hT3dgCQPDdy7i1gIgXNT6ZuDybsUw323hGwASlh3fxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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