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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42c18948a4588a507c4534f9667ec7fa51fc672254bda4c46569752b31737c88' 
  AND token = '7a0b00WougKfYhP8ZhYe771njx4DlRWppgN8LSBVf8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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