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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58092735f4fd10a34f80a1fd5baf5d35181ec927de004b372aa421cb27ef9588' 
  AND token = 'WeUzq1MOL/uFA4qL6Ds2OkjldgokhT5NGTSqy9k+cxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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