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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad33004bfdb9f7af02766a190ea634852f84049a779e48fde953eb0ecfcfb46' 
  AND token = 'g/LV3oEFWM5IOcy7paOTVsy7cK+vKtxwfw/o71wuPy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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