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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa236a2362d2521c6fae3f34ab3502e45a12c7655d3684f192b013e2447956c' 
  AND token = 'weGf2DYyf9C7lPTGQP91o+Emd1gfjFfm+EHctF8OZYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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