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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28e4417289737e2674d449394b3697723640eec490169683a9925db84d687c53' 
  AND token = 'pdirFGKO38cZ6QACn/uTLXjI+D+tobD8byJGrUWC5SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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