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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc1ae4949c81cb54690de218943a667a98308c581a0743d1cba7edddf4508121' 
  AND token = 'UYUG26ZA9JPibPy/WWR9ZYLGGxekdJ/Hlftda8d57lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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