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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2fa18b0917677fc7d51ced6d90ed310d9996d3bfbfbafa1ddce76702ddca7f' 
  AND token = '9nwZJbyVXkg/+5lfTQwC+btwkm21Tr1tGOUc8k/v+7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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