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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89d64a49b44906acfe1da1e914275b972aa648c5f35317c23f5cd85c79373f1' 
  AND token = 'ozUz5rVGvT4EXC6DSz3QfVKUKxbAw4dT5+xitkkmoNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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