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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa569594a149fa5a303aef762714f884fea547543c9191c1b198ad0c603db0eb' 
  AND token = 'dNGYE55Ke1D2ANpCAa29MJIq3HK7i+Y0TRVRtlZynzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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