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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1bfdcc6691b969982fd2961cd7ef3d166556714982b9764f163f0eba53ed29f' 
  AND token = '+RkdbyMOtyJ0oR+eZPF6vPI9uxbbzhrrjh21e+OkXzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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