SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45ff1d24b34929744f0cf3a4bccd8c56b11f2b606b77ae67db465e8eee33eed4' 
  AND token = 'dTfSmxfWJDKah3LYvx9gCD/TCswE+G7vo2x/LqaF/JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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