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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '381bf7a83a8a997d609d78b8eb0031812c216b29085921c183764830bf4d0ef8' 
  AND token = 'a0L0amvJzCmXzXMFMkcjrv0S4OiUs5QfLWHxIYNnD10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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