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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47da238d1ccb7005a2445c67d76c8a21e183d5787d5aed8411712e4224066ab' 
  AND token = 'FoDrbYtKpv6eRecWI3N+ZXk6XeTv3GClne9aNcLpJLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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