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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4baa5e3cc43989d75a5515956af7183c19764dc4ca31b7f246e1e547d9ee816' 
  AND token = '4Ips6EzZBTz5gqWM6iJvGoaF9xDO2phYMid/lu1p3NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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