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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec0c603bee06be5fe3fa5d9139ff8f7ec4e12f62ea92aaa0940f33c8898f9406' 
  AND token = 'Wg8XIEtvLE4CccSXbGeQ6oG9U8Rygpkv8DFxwlaOPuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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