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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e31d114a46278d159161839e69ae72e7b06b4fcbab25d4a1cbc2a17d9f31ec' 
  AND token = 'fnZdZDx3tiAZHDQXFjQ1Y5xaymySzY46Ht2/gC+v2gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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