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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d120f15add109d14528e59818c2942823922300b9dcbe004c8dc5579e9b8470' 
  AND token = 'wGUt174/5EGmqqXT4uY6QInk6cug7x+jgYmGTzWCBHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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