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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb313bfabd6f0ddc33700fa03baa5973b8330b6e262b2230f177d6a42fcf8ceb' 
  AND token = 'G+iwfWQjPU1r+/gyg7/WJLRC6SaYhmjjHUH7QlmNgpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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