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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cb7797fa0dc651bb3d6229f6a8e766c088901667f3808a817415a8c067a0d09' 
  AND token = 'fNe6DcslTWFg6PFBiEXZ6J6mrV1b2KlbbtDcs8Bbch8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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