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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94562897628f10bb07f434a36d7465678e76379856705a404047202e753c0502' 
  AND token = 'vKDO1rCypGn4ilsz/cQgyD4dMxMfBgsrl2M2QqnrEzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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