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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02d109ed930fe9d9ce4176d03babfa49665fa9104c609ff8ac6daa82ed007f1' 
  AND token = 'yr7+MhjO4+l/TYx/zrxyuHACa5cqpAnwlbj0Th7ejtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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