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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b85be23ffa1f6fb0b3f5aba571872b3ddb27999194e158de792e7b2622f6d596' 
  AND token = 'WFBS5rqPt2CHDmqSRPiLIhkZxR4k/mmREucX73WNUA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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