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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '892641618d88b81f69479a51d6408655466e750545bebb7774fe36effc7c4290' 
  AND token = 'eVYR24Bc9CxsuriiIIyts7mf9ukfDuefnAB4L3aZMuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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