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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c8ba8cf3e1996347d8ca900b688064f830a9ac4b6af15443bec0300447f996' 
  AND token = '0cHAeWeNMVZXgHocPF0XDVLDap3QK1onR/jp/eEAbvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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