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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b1ee28a5d6a86c39b4fef4289dd472128eccd0b588858bd0c93d8a61c56d354' 
  AND token = '8DDbMjXeprluubs49jYWevgPP9Ykbjf1bW2ElzkyQ+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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