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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3339a104111e96081081aa07bb71a441e72313c8965f88ac5d59ee16e41b76' 
  AND token = 'P9ONFcfW7Z4AWCqteBKXYco2X65vlz2GMDgdqms0WXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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