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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39055a3e0bb4fa35e51d2ed7a483b547172b4bd32026fc771a83856820b49c8a' 
  AND token = '3mcj/nfoUE9NlLxKqR+ado38MFRzW0OwIMmlkA//8qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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