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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52ebd0e692a6a35e78fc571c44d61aa30ab1406262c7c233e9b3f7a4ce0a48d' 
  AND token = 'VjU5Dt8qaQMYRVNeNg7clo3ks7qTsW+tmOXz4xUgE0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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