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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db686d8c8139c05963c28ff811913a75efb306b8100fe4958807733c487b790' 
  AND token = 'XwjYnulzcLV2wQNzTVAyDf3jHGoQ25990ho075dkR5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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