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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c99cbaeaca386d6fa27e59e3b29ed2668940e76f7c4f1e57d2a4cee59df000' 
  AND token = 'hYljbGS8dJyFoaZgWWLTHk8jkEvSbT2tygx/7sAbxaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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