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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2398d8d5922615b83c8b80a61fcb4e502c736e8634872e762538817a603690b8' 
  AND token = 'v73Ivcr4kPoVUrJHggqZ4YQJI77Z8t883E2eJSlE4Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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