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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f34568b9fa83c644ef5b69c205a4dde90d96ba3811d0e57c536b0c68299083' 
  AND token = 'wf+sJwPtkbGngaisRYqzRRMxd50WPj8AygEMCtBajn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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