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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d5bbf961ce89c2e6c49cce9967ef2e4ca53ed38285253f5c77fda035007eab' 
  AND token = 'rBfV+OR+45dHwzbQ85CQm5F/AUimT5kLUlOuT67f/6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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