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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613e2b113ea861759c97288ae6ae523595b73f6ffbeb1efd6bad3a367888c59a' 
  AND token = 'sg7287IdVfU39XUkh+Gs3hiktwgqaYIef1N868YCqUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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