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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ce9ed8a47bb02a0b0c6bd836ab628cc8f17cb26f9c60be9815d26ceb8054d5' 
  AND token = '17/TKV+o1mogvUB8iMSZ03HmXLP7hKyAD1wopZ92uBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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