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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f4a6d70cea9c421f3afe8b6c7ea380c32f731ebda3cbc2626ac215a558bfb02' 
  AND token = 'asaQtWxm9X7X51dQFetM6PT9O7eLayB/d+Fte0PbQSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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