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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85b74c73c73da4afbff817aaf11728466577507abfa290d785d672724f832fe' 
  AND token = 'udrOU7GSEFt7sCLUlbn8FRfxMP5Zbk3OZ9mw4Rxf6a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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