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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead6c9fbd4187444037bbb9d0ea2f5da2d2577523dff8ef01948a15155b98c02' 
  AND token = 'm9lnmbdr22VFbFgFBBDTbih7sccqs7GPUOgFqtLYUHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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