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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b73cb47e3abdde052a2f0d2fd48c66c8d8f1ec65470508f913ed74a70fc33a4' 
  AND token = 'XYP4rZntpzgp86Y6ZL+d6tZWfO2MQHoKp8sqWD44J+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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