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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4445ddd13718144578e63523821dd0dcb9348cd3c8abe9b486aa953cd6f36ecd' 
  AND token = 'LC+h7mpXMt+gQnbCAB2MCKJgK5ItiM1o6PNwg4PQxkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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